<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>7-27</title>
	</head>
	<body>
	   <script  type="text/javascript" charset="utf-8">
		   var b=1;
		   function outer(){
			   var b=2;
			   function inner(){
				   b++;
				   var b=3;
				   console.log(b)
			   }
			   inner();
		   }
		   outer()
	   </script>
	</body>
</html>
